test: add optional live controller smoke tests

[tnware]

Summary

• Add opt-in live smoke tests for authenticating to a real UniFi controller and listing sites.
• Add an optional read-only device listing smoke test gated by UNIFI_SITE_NAME.
• Document the required environment variables and register a live pytest marker.

Why

The existing suite is useful for unit/regression coverage, but it does not prove the client still works against a live controller. These tests stay skipped in normal CI unless credentials are explicitly provided, while giving maintainers a repeatable real-controller check before releases or risky auth/API changes.

Test Plan

• python -m pytest tests/test_live_controller.py -q — passes with 2 skipped when no live controller env vars are configured.
• python -m pytest -q — 14 passed, 2 skipped.
• ruff check . — passed.
• python -m build — passed.
• twine check dist/* — passed.
• sphinx-build -E -W -b html docs docs/_build/html — passed.
• git diff --check — passed.

Note: no live UniFi controller credentials were configured in this environment, so the new live tests were validated only for safe skip behavior here.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 107018ee-b2a3-41fe-820d-9bcf3406efb0

📥 Commits

Reviewing files that changed from the base of the PR and between b7d6021 and 75ca1a9.

📒 Files selected for processing (4)

• .env.example
• README.md
• pyproject.toml
• tests/test_live_controller.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch test/live-controller-smoke

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